Lightmap issue - generated spots

Hello there, glad to have you here!

I’ve been trying out some light-mapping lately, and I have this problem. I have tried pretty much everything, but I cannot get it to work.
Any suggestions? have a look at the attachment and give me something to work with! Screenshot - d3eade59d3617bea91d0de3ea991176c - Gyazo
Thanks! :slight_smile:

I really need some help with this guys, asap.